TMS320F28377D Datasheet, PDF (84/110 Pages) Texas Instruments – TMS320F2837XD Dual-Core Delfino Microcontrollers

TMS320F28377D, TMS320F28376D
SPRS880 – DECEMBER 2013
www.ti.com
6.2.2 Enhanced Pulse Width Modulator (ePWM)
The enhanced pulse width modulator (ePWM) peripheral is a key element in controlling many of the power
electronic systems found in both commercial and industrial equipment. The ePWM type-3 module is able
to generate complex pulse width waveforms with minimal CPU overhead by building the peripheral up
from smaller modules with separate resources that can operate together to form a system. Some of the
highlights of the ePWM type-3 module include complex waveform generation, dead-band generation, a
flexible synchronization scheme, advanced trip-zone functionality, and global register reload capabilities.
Figure 6-7 shows the signal interconnections with the ePWM.
Time-Base (TB)
TBPRD Shadow (24)
TBPRD Active (24)
TBPRDHR (8)
8
CTR=PRD
TBCTL[PHSEN]
Counter
Up/Down
(16 Bit)
TCBNT
Active (16)
CTR=ZERO
CTR_Dir
TBPHSHR (8)
16
8
TBPHS Active (24)
Phase
Control
CTR=CMPA
CMPAHR (8)
16
CMPA Active (24)
CMPA Shadow (24)
Action
Qualifier
(AQ)
EPWMA
CTR=ZERO
CTR=CMPB
Disabled
Sync
In/Out
Select
Mux
EPWMxSYNCO
TBCTL[SYNCOSEL]
TBCTL[SWFSYNC]
(Software Forced
Sync)
EPWMxSYNCI
DCAEVT1.sync
DCBEVT1.sync
CTR=PRD
CTR=ZERO
CTR=PRD or ZERO
CTR=CMPA
CTR=CMPB
CTR_Dir
Event
Trigger
and
Interrupt
EPWMxINT
EPWMxSOCA
EPWMxSOCB
(A)
DCAEVT1.soc
(ET)
EPWMxSOCA
(A)
ADC
DCBEVT1.soc
EPWMxSOCB
High-resolution PWM (HRPWM)
EPWMxA
CTR=CMPB
16
CMPB Active (16)
CMPB Shadow (16)
EPWMB
Dead
Band
(DB)
PWM
Chopper
(PC)
Trip
Zone
(TZ)
CTR=ZERO
DCAEVT1.inter
DCBEVT1.inter
DCAEVT2.inter
DCBEVT2.inter
EPWMxB
EPWMxTZINT
TZ1 to TZ3
EMUSTOP
CLOCKFAIL
EQEP1ERR
(A)
DCAEVT1.force
(A)
DCAEVT2.force
(A)
DCBEVT1.force
(A)
DCBEVT2.force
A. These events are generated by the Type 1 ePWM digital compare (DC) submodule based on the levels of the
COMPxOUT and TZ signals.
Figure 6-7. ePWM Sub-Modules Showing Critical Internal Signal Interconnections
84
Peripheral Information and Timings
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